Release v1.30.0

[r-hang]

This release contains the following changes:

• AddTemplate template option.
• thriftbreak: support for changed types, new files, and optional JSON output.
• String() performance improvements for string type definitions.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
9 out of 10 committers have signed the CLA.

:white_check_mark: witriew
:white_check_mark: abhinav
:white_check_mark: shirchen
:white_check_mark: kishoresenji
:white_check_mark: jparise
:white_check_mark: KarboniteKream
:white_check_mark: clayne11
:white_check_mark: moisesvega
:white_check_mark: r-hang
:x: dependabot[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[codecov[bot]]

Codecov Report

Merging #567 (8837a25) into master (e322a82) will increase coverage by 0.77%. The diff coverage is 78.99%.

@@            Coverage Diff             @@
##           master     #567      +/-   ##
==========================================
+ Coverage   67.32%   68.09%   +0.77%     
==========================================
  Files         135      139       +4     
  Lines       23531    23838     +307     
==========================================
+ Hits        15842    16233     +391     
+ Misses       4593     4544      -49     
+ Partials     3096     3061      -35     

Impacted Files	Coverage Δ
ast/annotation.go	91.66% <ø> (ø)
ast/basetypeid_string.go	75.00% <ø> (ø)
ast/constant.go	46.42% <ø> (ø)
ast/definition.go	74.50% <ø> (ø)
ast/header.go	40.00% <ø> (ø)
ast/position.go	100.00% <ø> (ø)
ast/program.go	66.66% <ø> (ø)
ast/type.go	33.84% <ø> (ø)
ast/visitor.go	0.00% <ø> (ø)
ast/walk.go	87.50% <ø> (ø)
... and 117 more

... and 3 files with indirect coverage changes

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